chore(deps): update dependency svelte to v4.2.19 [security]

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
svelte (source)	4.2.15 -> 4.2.19

GitHub Vulnerability Alerts

CVE-2024-45047

Summary

A potential XSS vulnerability exists in Svelte for versions prior to 4.2.19.

Details

Svelte improperly escapes HTML on server-side rendering. It converts strings according to the following rules:

• If the string is an attribute value:
  • " -> "
  • & -> &
  • Other characters -> No conversion
• Otherwise:
  • < -> <
  • & -> &
  • Other characters -> No conversion

The assumption is that attributes will always stay as such, but in some situation the final DOM tree rendered on browsers is different from what Svelte expects on server-side rendering. This may be leveraged to perform XSS attacks. More specifically, this can occur when injecting malicious content into an attribute within a <noscript> tag.

PoC

A vulnerable page (+page.svelte):

<script>
import { page } from "$app/stores"

// user input
let href = $page.url.searchParams.get("href") ?? "https://example.com";
</script>

<noscript>
  <a href={href}>test</a>
</noscript>

If a user accesses the following URL,

http://localhost:4173/?href=</noscript><script>alert(123)</script>

then, alert(123) will be executed.

Impact

XSS, when using an attribute within a noscript tag

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Release Notes

sveltejs/svelte (svelte)

### [`v4.2.19`](https://redirect.github.com/sveltejs/svelte/releases/tag/svelte%404.2.19) [Compare Source](https://redirect.github.com/sveltejs/svelte/compare/svelte@4.2.18...svelte@4.2.19) ##### Patch Changes - fix: ensure typings for `` are picked up ([#​12902](https://redirect.github.com/sveltejs/svelte/pull/12902)) - fix: escape `<` in attribute strings ([#​12989](https://redirect.github.com/sveltejs/svelte/pull/12989)) ### [`v4.2.18`](https://redirect.github.com/sveltejs/svelte/releases/tag/svelte%404.2.18) [Compare Source](https://redirect.github.com/sveltejs/svelte/compare/svelte@4.2.17...svelte@4.2.18) ##### Patch Changes - chore: speed up regex ([#​11922](https://redirect.github.com/sveltejs/svelte/pull/11922)) ### [`v4.2.17`](https://redirect.github.com/sveltejs/svelte/releases/tag/svelte%404.2.17) [Compare Source](https://redirect.github.com/sveltejs/svelte/compare/svelte@4.2.16...svelte@4.2.17) ##### Patch Changes - fix: correctly handle falsy values of style directives in SSR mode ([#​11584](https://redirect.github.com/sveltejs/svelte/pull/11584)) ### [`v4.2.16`](https://redirect.github.com/sveltejs/svelte/releases/tag/svelte%404.2.16) [Compare Source](https://redirect.github.com/sveltejs/svelte/compare/svelte@4.2.15...svelte@4.2.16) ##### Patch Changes - fix: check if svelte component exists on custom element destroy ([#​11489](https://redirect.github.com/sveltejs/svelte/pull/11489))

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